Projector

Abstract

A projector including an illumination device, an electra-optic modulator and a projection optical system. The illumination device is provided with a light source that emits a substantially parallel luminous flux to the side of a region to be illuminated; a first lens array including a plurality of first small lenses; a second lens array including a plurality of second small lenses corresponding to the first lens array; and a superimposing lens that superimposes the partial luminous fluxes coming from the second lens array. The projector further including a light shielding member provided with a stray light elimination member disposed to be substantially optically conjugate with the plurality of first small lenses and the electro-optic modulator for adjusting the cross-section shape of the luminous flux; and a rotating prism for scanning the luminous flux from the light shelding member in synchronization with a frame rate of the electro-optic modulator.

1. A projector, comprising:
 an illumination device provided with: 
 a light source device that emits a substantially parallel luminous flux to a side of a region to be illuminated; 
 a first lens array including a plurality of first small lenses that divide the luminous flux coming from the light source device into a plurality of partial luminous fluxes; 
 a second lens array including a plurality of second small lenses corresponding to the plurality of first small lenses of the first lens array; and 
 a superimposing lens that superimposes, in the region to be illuminated, the partial luminous fluxes coming from the plurality of second small lenses of the second lens array, 
 an electro-optic modulator that modulates the luminous flux coming from the illumination device in accordance with image information, each first small lens in the first lens array has a plane shape compressed in a direction which is either vertical or horizontal direction of the image formation region of the electro-optic modulator to make the luminous flux coming from the illumination device entirely illuminate an image formation region of the electro-optic modulator in the other direction thereof, and partially illuminate the image formation region in the one direction; 
 a light shielding member that is disposed between the illumination device and the electro-optic modulator to be substantially optically conjugate with the plurality of first small lenses and the electro-optic modulator for adjusting the cross section shape of the luminous flux; and 
 a rotating prism that is disposed on a side of the electro-optic modulator of the light shielding member for scanning, on the image formation region of the electro-optic modulator, the luminous flux coming from the light shielding member along the one direction in synchronization with a frame rate of the electro-optic modulator, 
 a stray light elimination member provided with the light shielding member that reflects a reflection light from a light incident surface of the rotating prism in a direction different from the rotating prism; and 
 a projection optical system that projects a light modulated by the electro-optic modulator. 
 
   
   
     2. The projector according to  claim 1 , wherein
 An aperture is provided on the light shielding member; 
 the stray light elimination member is a triangular prism that is provided on both side portions of the aperture in the one direction, and reflects the reflection light from the light incident surface of the rotating prism substantially along the one direction. 
 
   
   
     3. The projector according to  claim 1 , wherein
 An aperture is provided on the light shielding member; 
 the stray light elimination member is a reflection mirror that is provided on both side portions of the aperture in the one direction, and reflects the reflection light from the light incident surface of the rotating prism substantially along the one direction. 
 
   
   
     4. The projector according to  claim 1 , wherein
 An aperture is provided on the light shielding member; 
 the stray light elimination member is a reflection mirror that is provided on both side portions of the aperture in the one direction, and reflects the reflection light from the light incident surface of the rotating prism toward a side of the illumination device. 
 
   
   
     5. The projector according to  claim 1 , wherein
 the light source device is provided with an arc tube, an ellipsoidal reflector that reflects a light from the arc tube, and a collimating lens that collimates a light reflected by the ellipsoidal reflector, or provided with the arc tube, and a paraboloidal reflector that reflects the light from the arc tube as a substantially collimated light. 
 
   
   
     6. The projector according to  claim 5 , wherein
 the arc tube is provided with an auxiliary mirror that reflects, toward the arc tube, the light emitted from the arc tube toward the side of the region to be illuminated. 
 
   
   
     7. The projector according to  claim 1 , comprising:
 a color-separation and light-guiding system that is disposed between the rotating prism and the electro-optic modulator, and separates the luminous flux coming from the rotating prism into a plurality of color lights; 
 two or more of the electro-optic modulator that modulate the color lights coming from the color-separation and light-guiding system in accordance with image information corresponding to each of the color lights; and 
 a cross dichroic prism that combines the color lights modulated in the electro-optic modulators.